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Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements


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10 Questions MCQ Test Chemistry for JEE | Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements

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Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 1

Aluminium is extracted by the electrolysis of         [2002]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 1

Pure aluminium can be obtained by  electrolysis of a mixture containing alumina, crayolite and fluorspar in the ratio 20 : 24 : 20. The fusion temperature of this mixture is 900ºC and it is a good conductor of electricity

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 2

The metal extracted by leaching with a cyanide is                  [2002]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 2

Silver ore forms a soluble complex with NaCN from which silver is precipitated using scrap zinc.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 3

Which one of the following ores is best concentrated byfroth-flotation method ?       [2004]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 3

Froth ­flotation method is used for the concentration of sulphide ores. The method is based on the preferential wetting properties with the frothing agent and water. In the given options, Galena (PbS) is the only sulphide ore.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 4

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are    [2005]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 4

During the process of electrolytic refining Ag and Au are obtained as anode mud.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 5

Which of the following factors is of no significance forroasting sulphide ores to the oxides and not subjecting thesulphide ores to carbon reduction directly? [2008]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 5

NOTE : The reduction of metal sulphides by carbon reduction process is not spontaneous because DG for such a process is positive. The reduction of metal oxide
by carbon reduction process is spontaneous as DG for such a process is negative.
From this we find that on thermodynamic considerations CO2 is more stable than CS2 and the metal sulphides are more stable than corresponding oxides.
In view of above the factor listed in choice (c) is incorrect and so is of no significance.
Hence the correct answer is (c)

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 6

29.5 mg of an organic compound containing nitrogen wasdigested according to Kjeldahl’s method and the evolvedammonia was absorbed in 20 mL of 0.1 M HCl solution. Theexcess of the acid required 15 mL of 0.1 M NaOH solutionfor complete neutralization. The percentage of nitrogen inthe compound is                [2010]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 6

Moles of HCl taken = 20 × 0.1 × 10–3 =  2 × 10–3
Moles of HCl neutralised by NaOH solution
= 15 × 0.1 × 10–3 = 1.5 × 10–3
Moles of HCl neutralised by ammonia
= 2 × 10–3 – 1.5 × 10–3
= 0.5 × 10–3

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 7

Which method of purification is represented by the following equation ? [2012]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 7

Van Arkel is a method in which heat treatment is used to purify metal in this process metals are converted into other metal compound for loosly coupled like as iodine to make metal iodide which are easily decomposed and give pure metal.
The process is known as Van Arkel method.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 8

The metal that cannot be obtained by electrolysis of anaqueous solution of its salts is: [JEE M 2014]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 8

On electrolysis of aqueous solution of s-block elements H2 gas discharge at cathode.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 9

In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false ?[JEE M 2015]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 9

In Hall-Heroult process,
2 Al2O3 + 3 C → 4 Al + 3CO2
Oxygen liberated at anode reacts with carbon anode to give CO and CO2.

Na3AlF6 (cryolite) or CaF2 is mixed with purified Al2O3 to lower the melting point for easier electrolysis.

Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 10

Which one of the following ores is best concentrated byfroth floatation method? [JEE M 2016]

Detailed Solution for Test: 35 Year JEE Previous Year Questions: General Principles & Processes of Isolation of Elements - Question 10

Froth floatation method is mainly applicable for
sulphide ores.
(1) Malachite ore : Cu(OH)2 . CuCO3
(2) Magnetite ore : Fe3O4
(3) Siderite ore : FeCO3
(4) Galena ore : PbS (Sulphide Ore)

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